Java 中的 DoubleBuffer slice()方法，示例
原文:https://www . geesforgeks . org/double buffer-slice-method-in-Java-with-examples/
类的 slice() 方法用于创建一个新的双缓冲区，其内容是给定缓冲区内容的共享子序列。
新缓冲区的内容将从该缓冲区的当前位置开始。对此缓冲区内容的更改将在新缓冲区中可见，反之亦然。两个缓冲器的位置、极限和标记值将是独立的。
新缓冲区的位置将为零，其容量和限制将是该缓冲区中剩余的双精度数，其标记将是未定义的。如果且仅当该缓冲区是直接的，则新缓冲区将是直接的；如果且仅当该缓冲区是只读的，则新缓冲区将是只读的。
语法:
public abstract DoubleBuffer slice()
返回值:该方法返回新的双缓冲区。
下面是说明 slice()方法的示例:
实施例 1:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// slice() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the DoubleBuffer
int capacity = 10;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer
// and allocating size capacity
DoubleBuffer fb1 = DoubleBuffer.allocate(capacity);
// putting the value in Doublebuffer
fb1.put(8.56F);
fb1.put(9.61F);
// print the DoubleBuffer
System.out.println("Original DoubleBuffer: "
+ Arrays.toString(fb1.array()));
// print the DoubleBuffer position
System.out.println("\nposition: " + fb1.position());
// print the DoubleBuffer capacity
System.out.println("\ncapacity: " + fb1.capacity());
// Creating a shared subsequence buffer of given DoubleBuffer
// using slice() method
DoubleBuffer fb2 = fb1.slice();
// print the shared subsequence buffer
System.out.println("\nshared subsequence DoubleBuffer: "
+ Arrays.toString(fb2.array()));
// print the DoubleBuffer position
System.out.println("\nposition: " + fb2.position());
// print the DoubleBuffer capacity
System.out.println("\ncapacity: " + fb2.capacity());
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output
Original DoubleBuffer: [8.5600004196167, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
position: 2
capacity: 10
shared subsequence DoubleBuffer: [8.5600004196167, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
position: 0
capacity: 8
实施例 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// slice() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the DoubleBuffer
int capacity = 10;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer
// and allocating size capacity
DoubleBuffer fb1 = DoubleBuffer.allocate(capacity);
// putting the value in Doublebuffer
fb1.put(8.56F);
fb1.put(9.61F);
fb1.put(0.56F);
fb1.put(3.61F);
// print the DoubleBuffer
System.out.println("Original DoubleBuffer: "
+ Arrays.toString(fb1.array()));
// print the DoubleBuffer position
System.out.println("\nposition: " + fb1.position());
// print the DoubleBuffer capacity
System.out.println("\ncapacity: " + fb1.capacity());
// Creating a shared subsequence buffer of given DoubleBuffer
// using slice() method
DoubleBuffer fb2 = fb1.slice();
fb2.put(2.34F);
fb2.put(6.34F);
// print the shared subsequence buffer
System.out.println("\nshared subsequence DoubleBuffer: "
+ Arrays.toString(fb2.array()));
// print the DoubleBuffer position
System.out.println("\nposition: " + fb2.position());
// print the DoubleBuffer capacity
System.out.println("\ncapacity: " + fb2.capacity());
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output
Original DoubleBuffer: [8.5600004196167, 9.609999656677246, 0.5600000023841858, 3.609999895095825, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
position: 4
capacity: 10
shared subsequence DoubleBuffer: [8.5600004196167, 9.609999656677246, 0.5600000023841858, 3.609999895095825, 2.3399999141693115, 6.340000152587891, 0.0, 0.0, 0.0, 0.0]
position: 2
capacity: 6
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